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Yeah, it doesn't work out of the box. Just create accessor manually with signature

fun myExtension(cofigure: Action<MyExtension>)

in default package (ever if plugin and extension are in some package. When applying via plugins block it would be brought into settings script classpath and will look exactly like generated one

I was doing that but I was guessing if it was completely necessary, thank you :)

There are indeed no accessors generated in settings.

Is there an issue for this? 👀